I have installed the nforce drivers for my A7N8X on Mandrake 9.1 using the source file (NVIDIA_nforce-1.0-0256.src.rpm) to compile my own rpm. It works fine, except for an error on boot-up with regards to sound, although I still get sound!

I see you use Mandrake 9.0. I seem to remember some bug in a beta of MDK9.1 which gave trouble when trying to install the Nforce2 drivers, perhaps this is what you are experiencing in 9.0. I don't know what causes this, perhaps you have to upgrade to 9.1